Rapport des sexes, effort et succès de reproduction chez Rubus chamaemorus , plante herbacée vivace dioïque de distribution subarctique
Studies published on the reproductive success of dioecious species concentrate on the role of sex ratios and pollinator behaviour. In the case of Rubus chamaemorus L., a circumboreal dioecious species, we hypothesized that flower survival and biomass allocation to reproductive tissues, which are cli...
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Language: | English |
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Canadian Science Publishing
1987
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Online Access: | http://dx.doi.org/10.1139/b87-354 http://www.nrcresearchpress.com/doi/pdf/10.1139/b87-354 |
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crcansciencepubl:10.1139/b87-354 2023-12-17T10:49:20+01:00 Rapport des sexes, effort et succès de reproduction chez Rubus chamaemorus , plante herbacée vivace dioïque de distribution subarctique Dumas, Pascale Maillette, Lucie 1987 http://dx.doi.org/10.1139/b87-354 http://www.nrcresearchpress.com/doi/pdf/10.1139/b87-354 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 65, issue 12, page 2628-2639 ISSN 0008-4026 Plant Science journal-article 1987 crcansciencepubl https://doi.org/10.1139/b87-354 2023-11-19T13:38:51Z Studies published on the reproductive success of dioecious species concentrate on the role of sex ratios and pollinator behaviour. In the case of Rubus chamaemorus L., a circumboreal dioecious species, we hypothesized that flower survival and biomass allocation to reproductive tissues, which are climate dependent, also influence fruit production. Only 0.05% of total biomass is allocated to reproduction, whereas 94% goes to underground organs responsible for vegetative propagation. Many male (28 – 51%) and female flower buds (35 – 54%) and young fruits (24–51%) die prematurely mainly because of the climate; fruit production then becomes independent from initial female flower density. The scarcity of female flowers at most sites (except near open water) limits fruit production. The limited sexual reproduction would allow cloudberry to maintain somatic resources, thereby increasing the longevity of individuals and their chance of encountering the climatic conditions required for reproductive success. Such a strategy is adaptive in a variable climate like that of the subarctic. Furthermore, the reduced importance of sexual reproduction would diminish the need to optimize sex ratios. Other selective pressures (e.g., competition) would then favour male clones in most sites, in spite of the unproductive pollen excess. Article in Journal/Newspaper Rubus chamaemorus Subarctic subarctique* Canadian Science Publishing (via Crossref) Canadian Journal of Botany 65 12 2628 2639 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Plant Science |
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Plant Science Dumas, Pascale Maillette, Lucie Rapport des sexes, effort et succès de reproduction chez Rubus chamaemorus , plante herbacée vivace dioïque de distribution subarctique |
topic_facet |
Plant Science |
description |
Studies published on the reproductive success of dioecious species concentrate on the role of sex ratios and pollinator behaviour. In the case of Rubus chamaemorus L., a circumboreal dioecious species, we hypothesized that flower survival and biomass allocation to reproductive tissues, which are climate dependent, also influence fruit production. Only 0.05% of total biomass is allocated to reproduction, whereas 94% goes to underground organs responsible for vegetative propagation. Many male (28 – 51%) and female flower buds (35 – 54%) and young fruits (24–51%) die prematurely mainly because of the climate; fruit production then becomes independent from initial female flower density. The scarcity of female flowers at most sites (except near open water) limits fruit production. The limited sexual reproduction would allow cloudberry to maintain somatic resources, thereby increasing the longevity of individuals and their chance of encountering the climatic conditions required for reproductive success. Such a strategy is adaptive in a variable climate like that of the subarctic. Furthermore, the reduced importance of sexual reproduction would diminish the need to optimize sex ratios. Other selective pressures (e.g., competition) would then favour male clones in most sites, in spite of the unproductive pollen excess. |
format |
Article in Journal/Newspaper |
author |
Dumas, Pascale Maillette, Lucie |
author_facet |
Dumas, Pascale Maillette, Lucie |
author_sort |
Dumas, Pascale |
title |
Rapport des sexes, effort et succès de reproduction chez Rubus chamaemorus , plante herbacée vivace dioïque de distribution subarctique |
title_short |
Rapport des sexes, effort et succès de reproduction chez Rubus chamaemorus , plante herbacée vivace dioïque de distribution subarctique |
title_full |
Rapport des sexes, effort et succès de reproduction chez Rubus chamaemorus , plante herbacée vivace dioïque de distribution subarctique |
title_fullStr |
Rapport des sexes, effort et succès de reproduction chez Rubus chamaemorus , plante herbacée vivace dioïque de distribution subarctique |
title_full_unstemmed |
Rapport des sexes, effort et succès de reproduction chez Rubus chamaemorus , plante herbacée vivace dioïque de distribution subarctique |
title_sort |
rapport des sexes, effort et succès de reproduction chez rubus chamaemorus , plante herbacée vivace dioïque de distribution subarctique |
publisher |
Canadian Science Publishing |
publishDate |
1987 |
url |
http://dx.doi.org/10.1139/b87-354 http://www.nrcresearchpress.com/doi/pdf/10.1139/b87-354 |
genre |
Rubus chamaemorus Subarctic subarctique* |
genre_facet |
Rubus chamaemorus Subarctic subarctique* |
op_source |
Canadian Journal of Botany volume 65, issue 12, page 2628-2639 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b87-354 |
container_title |
Canadian Journal of Botany |
container_volume |
65 |
container_issue |
12 |
container_start_page |
2628 |
op_container_end_page |
2639 |
_version_ |
1785573741804126208 |